The update for the Galaxy A12 is being released with the build number A127FXXU7CVL2, while the Galaxy M12 is receiving the update with the firmware version M127FXXU3CVL2. Currently, the update is only available in certain countries, including India, the Philippines, Saudi Arabia, and the United Arab Emirates for the Galaxy A12, and Russia for the Galaxy M12.
If you own either of these devices and are located in one of these countries, you can download the update by going to the “Software Upgrade” settings in the phone’s settings and selecting the “Download and Install” option. Before updating make sure to charge your phone to at least 50% and also take a backup of important data.